From the perspective of a bystander who is not engaged in actively gathering adamantine, nor actively seeking out smiths to commission for items made of it; I've seen Adamantine make it's way to the Outskirts of all places, for prices that a fresh level 2 can reasonably attain within a couple days of effort.
A coveted metal, solely sourced from falling stars landing within a hellish realm of extraplanar entities imprisoned in a permanent miniature portrayal of the Blood War, is being sold in the Outskirts. At this point, the availability of the material is ubiquitous enough that I can't imagine adding more would do anything other than serve to further drive down prices and create a market surplus, leading to the same state of affairs for low-mid range crafted goods, but for Adamantine. Vendors sitting in the Outskirts trying to sell off their half a dozen Adamantine Shields, struggling to find someone to buy one for five thousand gold, because supply and demand has cut the legs out of the market.
To players, I'm sure this is an appealing state of affairs, because who wouldn't want to kit out all their new characters with far better equipment? For server health, I perceive it as poisoning the well; a vast amount of the treasury drops are already invalidated without further edging out the few useful items due to ubiquitous availability of adamantine.